panic: runtime error: makeslice: len out of range

goroutine 11 [running]:
github.com/google/syzkaller/prog.cloneCalls({0xb9f803be70464fa7, 0x6c94ab8f7c3e5c14, 0x7f7ff7ebf108?}, 0xc000e5a000?)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/clone.go:21 +0x36
github.com/google/syzkaller/prog.(*Prog).Clone(0xc000198500)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/clone.go:14 +0x96
github.com/google/syzkaller/prog.(*randGen).resourceCentric(0xc0011a44a0, 0xc00104edc0, 0xeebda0, 0x60?)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:891 +0xb0
github.com/google/syzkaller/prog.(*ResourceType).generate(0xeebda0, 0xc0011a44a0, 0x415850?, 0x50?)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:706 +0xd4
github.com/google/syzkaller/prog.(*randGen).generateArgImpl(0xc0011a44a0, 0xc00104edc0, {0xb1a7b0?, 0xeebda0?}, 0x0, 0x0)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:694 +0x606
github.com/google/syzkaller/prog.(*randGen).generateArg(...)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:644
github.com/google/syzkaller/prog.(*randGen).generateArgs(0xfc81e0?, 0x0?, {0xf53200, 0x3, 0x3}, 0x0)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:632 +0x17b
github.com/google/syzkaller/prog.(*randGen).generateParticularCall(0xc0011a44a0, 0xc00104edc0?, 0xfc81e0)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:584 +0x85
github.com/google/syzkaller/prog.(*randGen).generateCall(0xc0011a44a0, 0xc00104edc0, 0xc001203d00?, 0xc001203d00?)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:573 +0xb6
github.com/google/syzkaller/prog.(*mutator).insertCall(0xc000701d60)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:152 +0xc5
github.com/google/syzkaller/prog.(*Prog).Mutate(0xc001203d00, {0xb12728?, 0xc000dd1f50}, 0x1e, 0xc000a84040, 0xc00007cc60, {0xc000d00000, 0x1101, 0x1400})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:49 +0x2ac
main.(*Proc).smashInput(0xc0002af640, 0xc00102cf50)
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/proc.go:219 +0x16b
main.(*Proc).loop(0xc0002af640)
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/proc.go:78 +0xf2
created by main.main
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:310 +0x1605